2018 Lexus IS300 tire pressure

5949-1. Specifications
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Type C
Type D
Tire size225/40R18 88Y, 255/35R18 90Y,
T125/70D17 98M (spare)
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Front:
36 psi (250 kPa, 2.5 kgf/cm2 or bar)
Rear:
36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Spare: 60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Driving at high speeds (above 137 mph [220 km/h]) (in
countries where such speeds are permitted by law)
Add 2 psi (10 kPa, 0.1 kgf/cm
2 or bar) to the front tires
and rear tires. Never exce ed the maximum cold tire
inflation pressure indicated on the tire sidewall.
Wheel size18 × 8J (225/40R18), 18 × 8 1/2J (255/35R18),
17 × 4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)
Tire size225/40R18 88W, 255/35R18 90W,
T125/70D17 98M (spare)
Tire inflation pressure
(Recommended cold tire
inflation pressure)
Front:
36 psi (250 kPa, 2.5 kgf/cm2 or bar)
Rear: 36 psi (250 kPa, 2.5 kgf/cm
2 or bar)
Spare: 60 psi (420 kPa, 4.2 kgf/cm
2 or bar)
Driving at high speeds (above 118 mph [190 km/h]) (in
countries where such speeds are permitted by law)
Add 6 psi (40 kPa, 0.4 kgf/cm
2 or bar) to the front
tires and rear tires. Never exceed the maximum cold
tire inflation pressure indi cated on the tire sidewall.
Wheel size18 × 8J (225/40R18), 18 × 8 1/2J (255/35R18),
17 × 4T (spare)
Wheel nut torque76 ft•lbf (103 N•m, 10.5 kgf•m)

6009-1. Specifications
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Tire size (→ P. 602)
TUBELESS or TUBE TYPE
A tubeless tire does not have a tube and air is directly put into the tire. A tube type tire
has a tube inside the tire and the tube maintains the air pressure.
Radial tires or bias-ply tires
A radial tire has “RADIAL” on the sidewall. A tire not marked “RADIAL” is a bias-ply
tire.
Summer tires or all season tires (→ P. 487)
An all season tire has “M+S” on the side wall. A tire not marked “M+S” is a summer
tire.
Maximum cold tire inflation pressure (→ P. 606)
This means the pressure to which a tire may be inflated.
Load limit at maximum cold tire inflation pressure (→ P. 606)
Tire ply composition and materials
Plies are layers of rubber-c oated parallel cords. Cords are the strands which form the
plies in a tire.
Uniform tire quality grading
For details, see “Uniform Tire Quality Grading” that follows.
DOT and Tire Identification Number (TIN) (→ P. 601)
Location of trea dwear indicators (→ P. 483)
“TEMPORARY USE ONLY”
A compact spare tire is identified by the phrase “TEMPORARY USE ONLY” molded
on its sidewall. This tire is designed for temporary emergency use only.
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6069-1. Specifications
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been parked for
three hours or more, or has no t been driven more than 1
mile or 1.5 km un der that condition
Maximum inflation pres-
sureThe maximum cold inflated pr essure to which a tire may
be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a manu-
facturer
Accessory weight
The combined weight (in exce ss of those standard items
which may be replaced) of automatic transmission,
power steering, power brakes, power windows, power
seats, radio and heater, to the extent that these items are
available as factory-installed equipment (whether
installed or not)
Curb weight
The weight of a motor vehicle with standard equipment,
including the maximum capacity of fuel, oil and coolant,
and if so equipped, air co nditioning and additional
weight optional engine
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the numb er of occupants specified
in the second column of Table 1* that follows
Occupant distributionDistribution of occupants in a vehicle as specified in the
third column of Table 1
* below
Production options weight
The combined weight of in stalled regular production
options weighing over 5 lb. (2.3 kg) in excess of the
standard items which they re place, not previously con-
sidered in curb weight or accessory weight, including
heavy duty brakes, ride levelers, roof rack, heavy duty
battery, and special trim
RimA metal support for a tire or a tire and tube assembly
upon which the tire beads are seated

6089-1. Specifications
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
CT
A pneumatic tire with an inverted flange tire and rim
system in which the rim is designed with rim flanges
pointed radially inward and the tire is designed to fit on
the underside of the rim in a manner that encloses the
rim flanges inside the air cavity of the tire
Extra load tireA tire designed to operate at higher loads and at higher
inflation pressures than the corresponding standard tire
GrooveThe space between two adjacent tread ribs
InnerlinerThe layer(s) forming the insi de surface of a tubeless tire
that contains the inflating medium within the tire
Innerliner separationThe parting of the innerliner from cord material in the
carcass
Intended outboard sidewall
(a) The sidewall that contains a whitewall, bears white
lettering, or bears manufacturer, brand, and/or
model name molding that is higher or deeper than
the same molding on the ot her sidewall of the tire,
or
(b) The outward facing sidewa ll of an asymmetrical tire
that has a particular side that must always face out-
ward when mounted on a vehicle
Light truck (LT) tire
A tire designated by its manufacturer as primarily
intended for use on lightweig ht trucks or multipurpose
passenger vehicles
Load ratingThe maximum load that a tire is rated to carry for a given
inflation pressure
Maximum load ratingThe load rating for a tire at the maximum permissible
inflation pressure for that tire
Maximum permissible infla-
tion pressureThe maximum cold inflation pr essure to which a tire may
be inflated
Measuring rimThe rim on which a tire is fitted for physical dimension
requirements
Open spliceAny parting at any junction of tread, sidewall, or inner-
liner that extends to cord material
Outer diameterThe overall diameter of an inflated new tire
Tire related termMeaning

6099-1. Specifications
9
Vehicle specifications
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Overall widthThe linear distance between the exteriors of the side-
walls of an inflated tire, including elev ations due to label-
ing, decorations, or protective bands or ribs
Passenger car tire
A tire intended for use on passenger cars, multipurpose
passenger vehicles, and trucks, that have a gross vehicle
weight rating (GVWR) of 10,000 lb. or less.
PlyA layer of rubber-coat ed parallel cords
Ply separationA parting of rubber compou nd between adjacent plies
Pneumatic tire
A mechanical device made of rubber, chemicals, fabric
and steel or other materials, that, when mounted on an
automotive wheel, provides the traction and contains
the gas or fluid that sustains the load
Radial ply tire
A pneumatic tire in which the ply cords that extend to
the beads are laid at substa ntially 90 degrees to the
centerline of the tread
Reinforced tire A tire designed to operate at higher loads and at higher
inflation pressures than the corresponding standard tire
Section width
The linear distance between the exteriors of the side-
walls of an inflated tire, excluding elevations due to
labeling, decoration, or protective bands
SidewallThat portion of a tire between the tread and bead
Sidewall separationThe parting of the rubber compound from the cord
material in the sidewall
Snow tire
A tire that attains a traction index equal to or greater
than 110, compared to the ASTM E-1136 Standard Ref-
erence Test Tire, when using the snow traction test as
described in ASTM F-1805-00, Standard Test Method
for Single Wheel Driving Traction in a Straight Line on
Snow-and Ice-Covered Surfaces, and which is marked
with an Alpine Symbol ( ) on at least one sidewall
Test rimThe rim on which a tire is fitted for testing, and may be
any rim listed as appropriate for use with that tire
Tire related termMeaning

620
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
9-3. Initialization
Items to initialize
The following items must be initialized for normal system operation after such
cases as the battery being reconnected
, or maintenance being performed on
the vehicle:
ItemWhen to initializeReference
Message indicating mainte-
nance is required• After the maintenance is per- formedP. 460
Tire pressure warning system
• When rotating the tires
• When changing the tire inflation
pressure by changing traveling
speed or load weight, etc.
P. 485
Oil maintenance• After the maintenance is per-formedP. 475

645Alphabetical index
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Hands-free system
(for cellular phone) ........................... 363
HD Radio
® system .............................. 330
Head restraints ........................................144
Headlights .................................................194 AFS (Adaptive Front-lighting System) ................................................. 195
Light switch ............................................ 194
Replacing light bulbs ....................... 509
Headlights cleaner............................... 202
Heaters Air conditioning system ..................407
Heated steering wheel ..................... 416
Outside rear view mirrors ...............412
Seat heaters ............................................417
Hill-start assist control ........................ 292
Hood .......................................................... 468 Open ....................................................... 468
Hooks Cargo hooks ........................................425
Coat hooks ............................................ 431
Retaining hooks (floor mat) ............. 26
Horn ............................................................ 148 I/M test ..................................................... 465
Identification
Engine .................................................... 586
Vehicle ................................................... 585
Ignition switch (engine switch) ......... 178
Illuminated entry system ..................... 419
Immobilizer system ................................ 68
Indicators .....................................................78
Initialization Engine oil maintenance data ....... 475
Maintenance ........................................460
Moon roof .............................................. 160
Multi-information display.................. 95
Power windows................................... 155
Tire pressure warning system ...............................485
Initiators (tire pressure warning system) .................................. 491
Inside door handle lights ..................... 418
Inside rear view mirror......................... 149
Instrument panel light control ............ 84
Intercooler ...............................................478
Intercooler coolant............................... 476 Capacity................................................ 590
Checking ............................................... 476
Preparing and checking before winter .................................... 297
Interior lights ............................................ 419 Wattage .................................................595
Intuitive parking assist .......................... 251
HI

651Alphabetical index
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Shift lock system..................................... 188
Shift position and gear position ...........81
Side airbags ............................................... 36
Side marker lights...................................194
Light switch ............................................ 194
Replacing light bulbs ....................... 509
Side mirrors ............................................... 151 Adjusting and folding.......................... 151
BSM (Blind Spot Monitor)............. 251
Linked mirror function when reversing ................................. 152
Mirror position memory .................. 139
Side turn signal lights ........................... 190 Replacing light bulbs ....................... 509
Turn signal lever .................................. 190
Side windows ...........................................154
Slip indicator........................................... 523
Smart access system with push-button start ....................... 127 Antenna location .................................. 127
Entry functions .............................. 116, 122
Starting the engine ............................. 178
SMS (Short message service)........... 371
Snow mode .............................................. 184
Snow tires ................................................ 299 Spare tire ................................................. 556
Inflation pressure................................593
Storage location ................................. 557
Spark plug ............................................... 590
Specifications......................................... 584
Speedometer .............................................. 81
Speed indicator........................................ 83
Steering lock ........................................... 180 Column lock release ........................ 180
Steering wheel ........................................ 147 Adjustment.............................................. 147
Audio switches .................................... 310
Heated steering wheel .....................416
Power easy access system .............139
Steering wheel position memory ..............................139
Stop lights Replacing light bulbs ...................... 509
Storage feature ....................................... 421
Stuck If the vehicle becomes stuck....... 580
Sun visors.................................................. 427
Sunshade Rear .......................................................... 429
Roof ............................................................159
*: For vehicles with a naviga tion system, refer to the
“NAVIGATION SYSTEM OWNER’S MANUAL”.